Display screen or portion thereof with an animated graphical user interface



FIG. 1 is a front view of a first image in a sequence for a firstembodiment of a display screen or portion thereof with an animatedgraphical user interface showing the new design;

FIG. 2 is a front view of a second image thereof;

FIG. 3 is a front view of a first image in a sequence for a secondembodiment of a display screen or portion thereof with an animatedgraphical user interface showing the new design; and,

FIG. 4 is a front view of a second image thereof.

The outermost broken line rectangle illustrates a display screen orportion thereof and forms no part of the claimed design. The remainingbroken lines illustrate portions of the graphical user interface thatform no part of the claimed design.

The appearance of the transitional image sequentially transitionsbetween the images shown in FIGS. 1-2 or FIGS. 3-4 . The process orperiod in which one image transitions to another forms no part of theclaimed design.

CLAIM We claim the ornamental design for a display screen or portionthereof with an animated graphical user interface, as shown anddescribed.